题干

在一个容积为2L的密闭容器中,加入0.8mol A2气体和0.6mol B2气体,一定条件下发生如下反应:A2(g)+B2(g)═2AB(g)△H<0,反应中各物质的浓度随时间的变化情况如图所示.下列说法正确的是(   )

A:图中a点的值为0.05

B:该反应的平衡常数K=0.03

C:平衡时A2的转化率为62.5%

D:温度升高,平衡常数K值增大

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答案(点此获取答案解析)

C

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完形填空

    People from every corner flooded into the streets that Christmas Eve. "Frosty the Snowman," and "Jingle Bells" 1 in stores; on the pavements, the street singers performed happily. Everyone was 2 by someone else, delighted and cheerful. I was alone.

    As one of 8 kids of a Brazilian family, brought up in America's crowded apartment, I'd spent several years searching for aloneness. Now,3, at 27, a college student after the 4 with my girlfriend, every cell inside me wanted to be alone,5  not at Christmas. My family had 6to Brazil and my friends were 7with their own lives. Dusk was approaching, and the fact that I had to return to my 8 home made me sad. Lights from windows blinked (闪烁), and I hoped someone would 9 from one of those homes to invite me inside with a Christmas tree decorated with shiny fake snow and 10 presents.

    At a market, I felt more 11 when people were buying lots of goods, which12 the gifts we received as children in my mind. I missed my family and wanted to cry for wanting to be alone and for having achieved it.

    Outside the church, a manger (小耶稣) had been set 13. I stood with others watching the scene, some of them 14 themselves, praying. As I walked home, I realized that leaving Brazil was still a painful experience as I struggled with 15 I had become in 15 years in America. I'd mourned (悲叹) the 16, but for the first time, I recognized what I'd gained. I was independent, 17 and healthy. My life was still ahead, full of 18.

    Sometimes the best gift is the one that you give yourself. That Christmas, I gave myself 19 for what I'd obtained up to now and promise to go forward. It is the best gift I've ever got, the one that I most 20.